Psi5 Aurigae
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 The location of ψ5 Aurigae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 46m 44.3388s[1] |
| Declination | +43° 34′ 38.737″[1] |
| Apparent magnitude (V) | 5.25[2] |
| Characteristics | |
| Spectral type | G0 V[3] |
| U−B color index | +0.06[2] |
| B−V color index | +0.570[4] |
| Astrometry | |
| Radial velocity (Rv) | –24[5] km/s |
| Proper motion (μ) | RA: –1.07[1] mas/yr Dec.: +164.25[1] mas/yr |
| Parallax (π) | 60.56 ± 0.73[1] mas |
| Distance | 53.9 ± 0.6 ly (16.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 4.13[5] |
| Details | |
| Mass | 1.079[6] M☉ |
| Radius | 1.18[6] R☉ |
| Surface gravity (log g) | 4.06[3] cgs |
| Temperature | 5,989[3] K |
| Metallicity [Fe/H] | +0.05[3] dex |
| Rotational velocity (v sin i) | 5.03[4] km/s |
| Age | 3.2[5] Gyr |
| Other designations | |
Psi5 Aurigae (ψ5 Aur, ψ5 Aurigae) is the Bayer designation for a star[8] in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 5.25.[2] Based upon parallax measurements made during the Hipparcos mission, this star is approximately 53.9 light-years (16.5 parsecs) distant from Earth.[1] There is an optical companion[8] which is 36 arcseconds away and has an apparent magnitude of +8.4.
The spectrum of this star shows it to be a G-type main sequence star with a stellar classification of G0 V.[3] It is similar in size, mass,[6] and composition to the Sun,[3] making this a solar analog. It is radiating energy into space at an effective temperature of 5,989 K,[3] giving it the golden-hued glow of a G-type star.[9]
Observation in the infrared shows an excess emission that suggests the presence of a circumstellar disk of dust, known as a debris disk. This material has a mean temperature of 60 K, indicating that it is orbiting at a distance of about 29 astronomical units from the host star. The dust has about half the mass of the Moon and is around 600 million years old.[10] The star is being examined for evidence of extrasolar planets,[11] but none have been found so far.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found. Note: see VizieR catalogue I/311.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 6.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
